You can now get 3gig data to browse for free though it didn't work in all sim but you might be lucky this time and it will not cost you anything to test it.
HOW TO GET 3GIG FROM MTN NIGERIA
All you need to do to get the New mtn 3gig internet data send 100H to 131 and you will recieve your 3gig internet data instantly if you are lucky and if you don't receive it keep sending 100H to 131 until you receive your's